arch/arm/xen/enlighten.c

   1 #include <xen/xen.h>
   2 #include <xen/events.h>
   3 #include <xen/grant_table.h>
   4 #include <xen/hvm.h>
   5 #include <xen/interface/vcpu.h>
   6 #include <xen/interface/xen.h>
   7 #include <xen/interface/memory.h>
   8 #include <xen/interface/hvm/params.h>
   9 #include <xen/features.h>
  10 #include <xen/platform_pci.h>
  11 #include <xen/xenbus.h>
  12 #include <xen/page.h>
  13 #include <xen/interface/sched.h>
  14 #include <xen/xen-ops.h>
  15 #include <asm/xen/hypervisor.h>
  16 #include <asm/xen/hypercall.h>
  17 #include <asm/system_misc.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/irqreturn.h>
  20 #include <linux/module.h>
  21 #include <linux/of.h>
  22 #include <linux/of_irq.h>
  23 #include <linux/of_address.h>
  24 #include <linux/cpuidle.h>
  25 #include <linux/cpufreq.h>
  26 #include <linux/cpu.h>
  27 #include <linux/console.h>
  28
  29 #include <linux/mm.h>
  30
  31 struct start_info _xen_start_info;
  32 struct start_info *xen_start_info = &_xen_start_info;
  33 EXPORT_SYMBOL(xen_start_info);
  34
  35 enum xen_domain_type xen_domain_type = XEN_NATIVE;
  36 EXPORT_SYMBOL(xen_domain_type);
  37
  38 struct shared_info xen_dummy_shared_info;
  39 struct shared_info *HYPERVISOR_shared_info = (void *)&xen_dummy_shared_info;
  40
  41 DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
  42 static struct vcpu_info __percpu *xen_vcpu_info;
  43
  44 /* These are unused until we support booting "pre-ballooned" */
  45 unsigned long xen_released_pages;
  46 struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata;
  47
  48 static __read_mostly unsigned int xen_events_irq;
  49
  50 static __initdata struct device_node *xen_node;
  51
  52 int xen_remap_domain_gfn_array(struct vm_area_struct *vma,
  53                                unsigned long addr,
  54                                xen_pfn_t *gfn, int nr,
  55                                int *err_ptr, pgprot_t prot,
  56                                unsigned domid,
  57                                struct page **pages)
  58 {
  59         return xen_xlate_remap_gfn_array(vma, addr, gfn, nr, err_ptr,
  60                                          prot, domid, pages);
  61 }
  62 EXPORT_SYMBOL_GPL(xen_remap_domain_gfn_array);
  63
  64 /* Not used by XENFEAT_auto_translated guests. */
  65 int xen_remap_domain_gfn_range(struct vm_area_struct *vma,
  66                               unsigned long addr,
  67                               xen_pfn_t gfn, int nr,
  68                               pgprot_t prot, unsigned domid,
  69                               struct page **pages)
  70 {
  71         return -ENOSYS;
  72 }
  73 EXPORT_SYMBOL_GPL(xen_remap_domain_gfn_range);
  74
  75 int xen_unmap_domain_gfn_range(struct vm_area_struct *vma,
  76                                int nr, struct page **pages)
  77 {
  78         return xen_xlate_unmap_gfn_range(vma, nr, pages);
  79 }
  80 EXPORT_SYMBOL_GPL(xen_unmap_domain_gfn_range);
  81
  82 static void xen_percpu_init(void)
  83 {
  84         struct vcpu_register_vcpu_info info;
  85         struct vcpu_info *vcpup;
  86         int err;
  87         int cpu = get_cpu();
  88
  89         pr_info("Xen: initializing cpu%d\n", cpu);
  90         vcpup = per_cpu_ptr(xen_vcpu_info, cpu);
  91
  92         info.mfn = __pa(vcpup) >> PAGE_SHIFT;
  93         info.offset = offset_in_page(vcpup);
  94
  95         err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info);
  96         BUG_ON(err);
  97         per_cpu(xen_vcpu, cpu) = vcpup;
  98
  99         enable_percpu_irq(xen_events_irq, 0);
 100         put_cpu();
 101 }
 102
 103 static void xen_restart(enum reboot_mode reboot_mode, const char *cmd)
 104 {
 105         struct sched_shutdown r = { .reason = SHUTDOWN_reboot };
 106         int rc;
 107         rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
 108         BUG_ON(rc);
 109 }
 110
 111 static void xen_power_off(void)
 112 {
 113         struct sched_shutdown r = { .reason = SHUTDOWN_poweroff };
 114         int rc;
 115         rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
 116         BUG_ON(rc);
 117 }
 118
 119 static int xen_cpu_notification(struct notifier_block *self,
 120                                 unsigned long action,
 121                                 void *hcpu)
 122 {
 123         switch (action) {
 124         case CPU_STARTING:
 125                 xen_percpu_init();
 126                 break;
 127         default:
 128                 break;
 129         }
 130
 131         return NOTIFY_OK;
 132 }
 133
 134 static struct notifier_block xen_cpu_notifier = {
 135         .notifier_call = xen_cpu_notification,
 136 };
 137
 138 static irqreturn_t xen_arm_callback(int irq, void *arg)
 139 {
 140         xen_hvm_evtchn_do_upcall();
 141         return IRQ_HANDLED;
 142 }
 143
 144 /*
 145  * see Documentation/devicetree/bindings/arm/xen.txt for the
 146  * documentation of the Xen Device Tree format.
 147  */
 148 #define GRANT_TABLE_PHYSADDR 0
 149 void __init xen_early_init(void)
 150 {
 151         int len;
 152         const char *s = NULL;
 153         const char *version = NULL;
 154         const char *xen_prefix = "xen,xen-";
 155
 156         xen_node = of_find_compatible_node(NULL, NULL, "xen,xen");
 157         if (!xen_node) {
 158                 pr_debug("No Xen support\n");
 159                 return;
 160         }
 161         s = of_get_property(xen_node, "compatible", &len);
 162         if (strlen(xen_prefix) + 3  < len &&
 163                         !strncmp(xen_prefix, s, strlen(xen_prefix)))
 164                 version = s + strlen(xen_prefix);
 165         if (version == NULL) {
 166                 pr_debug("Xen version not found\n");
 167                 return;
 168         }
 169
 170         pr_info("Xen %s support found\n", version);
 171
 172         xen_domain_type = XEN_HVM_DOMAIN;
 173
 174         xen_setup_features();
 175
 176         if (xen_feature(XENFEAT_dom0))
 177                 xen_start_info->flags |= SIF_INITDOMAIN|SIF_PRIVILEGED;
 178         else
 179                 xen_start_info->flags &= ~(SIF_INITDOMAIN|SIF_PRIVILEGED);
 180
 181         if (!console_set_on_cmdline && !xen_initial_domain())
 182                 add_preferred_console("hvc", 0, NULL);
 183 }
 184
 185 static int __init xen_guest_init(void)
 186 {
 187         struct xen_add_to_physmap xatp;
 188         struct shared_info *shared_info_page = NULL;
 189         struct resource res;
 190         phys_addr_t grant_frames;
 191
 192         if (!xen_domain())
 193                 return 0;
 194
 195         if (of_address_to_resource(xen_node, GRANT_TABLE_PHYSADDR, &res)) {
 196                 pr_err("Xen grant table base address not found\n");
 197                 return -ENODEV;
 198         }
 199         grant_frames = res.start;
 200
 201         xen_events_irq = irq_of_parse_and_map(xen_node, 0);
 202         if (!xen_events_irq) {
 203                 pr_err("Xen event channel interrupt not found\n");
 204                 return -ENODEV;
 205         }
 206
 207         shared_info_page = (struct shared_info *)get_zeroed_page(GFP_KERNEL);
 208
 209         if (!shared_info_page) {
 210                 pr_err("not enough memory\n");
 211                 return -ENOMEM;
 212         }
 213         xatp.domid = DOMID_SELF;
 214         xatp.idx = 0;
 215         xatp.space = XENMAPSPACE_shared_info;
 216         xatp.gpfn = __pa(shared_info_page) >> PAGE_SHIFT;
 217         if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
 218                 BUG();
 219
 220         HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
 221
 222         /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info
 223          * page, we use it in the event channel upcall and in some pvclock
 224          * related functions.
 225          * The shared info contains exactly 1 CPU (the boot CPU). The guest
 226          * is required to use VCPUOP_register_vcpu_info to place vcpu info
 227          * for secondary CPUs as they are brought up.
 228          * For uniformity we use VCPUOP_register_vcpu_info even on cpu0.
 229          */
 230         xen_vcpu_info = __alloc_percpu(sizeof(struct vcpu_info),
 231                                                sizeof(struct vcpu_info));
 232         if (xen_vcpu_info == NULL)
 233                 return -ENOMEM;
 234
 235         if (gnttab_setup_auto_xlat_frames(grant_frames)) {
 236                 free_percpu(xen_vcpu_info);
 237                 return -ENOMEM;
 238         }
 239         gnttab_init();
 240         if (!xen_initial_domain())
 241                 xenbus_probe(NULL);
 242
 243         /*
 244          * Making sure board specific code will not set up ops for
 245          * cpu idle and cpu freq.
 246          */
 247         disable_cpuidle();
 248         disable_cpufreq();
 249
 250         xen_init_IRQ();
 251
 252         if (request_percpu_irq(xen_events_irq, xen_arm_callback,
 253                                "events", &xen_vcpu)) {
 254                 pr_err("Error request IRQ %d\n", xen_events_irq);
 255                 return -EINVAL;
 256         }
 257
 258         xen_percpu_init();
 259
 260         register_cpu_notifier(&xen_cpu_notifier);
 261
 262         return 0;
 263 }
 264 early_initcall(xen_guest_init);
 265
 266 static int __init xen_pm_init(void)
 267 {
 268         if (!xen_domain())
 269                 return -ENODEV;
 270
 271         pm_power_off = xen_power_off;
 272         arm_pm_restart = xen_restart;
 273
 274         return 0;
 275 }
 276 late_initcall(xen_pm_init);
 277
 278
 279 /* empty stubs */
 280 void xen_arch_pre_suspend(void) { }
 281 void xen_arch_post_suspend(int suspend_cancelled) { }
 282 void xen_timer_resume(void) { }
 283 void xen_arch_resume(void) { }
 284 void xen_arch_suspend(void) { }
 285
 286
 287 /* In the hypervisor.S file. */
 288 EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op);
 289 EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op);
 290 EXPORT_SYMBOL_GPL(HYPERVISOR_xen_version);
 291 EXPORT_SYMBOL_GPL(HYPERVISOR_console_io);
 292 EXPORT_SYMBOL_GPL(HYPERVISOR_sched_op);
 293 EXPORT_SYMBOL_GPL(HYPERVISOR_hvm_op);
 294 EXPORT_SYMBOL_GPL(HYPERVISOR_memory_op);
 295 EXPORT_SYMBOL_GPL(HYPERVISOR_physdev_op);
 296 EXPORT_SYMBOL_GPL(HYPERVISOR_vcpu_op);
 297 EXPORT_SYMBOL_GPL(HYPERVISOR_tmem_op);
 298 EXPORT_SYMBOL_GPL(HYPERVISOR_multicall);
 299 EXPORT_SYMBOL_GPL(privcmd_call);